I would not use a duro 70 in that application. The pressure differential is way too high. Please try a new, known good duro 85-90 for the piston stem o-ring.I changed the Duro 90 O-Ring (#11 in rsinglers schematic) to a Duro 70
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I would not use a duro 70 in that application. The pressure differential is way too high. Please try a new, known good duro 85-90 for the piston stem o-ring.I changed the Duro 90 O-Ring (#11 in rsinglers schematic) to a Duro 70